Bearthite Mineral Data

Bearthite Mineral Data +

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General Bearthite Information

Chemical Formula:

Ca2Al(PO4)2(OH)

Composition:

Molecular Weight = 314.09 gm

Calcium 25.52 % Ca 35.71 % CaO

Aluminum 8.59 % Al 16.23 % Al₂O₃

Phosphorus 19.72 % P 45.19 % P₂O₅

Hydrogen 0.32 % H 2.87 % H₂O

Oxygen 45.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Al(PO₄)₂(OH)

Environment:

In synmetamorphic quartz segregations and as an accessory mineral in high-pressure metamorphic rocks. Experimental study indicates that the stability of bearthite is restricted to v ery Ca-poor or P-rich rocks under mode

IMA Status:

Approved IMA 1993

Locality:

Found on the western ridge of the Stockhorn, Zermatt Valley, Valais, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Honors Professor Peter Bearth (1902-1989), for his pioneering petrologic studies of the high-pressure terranes of the western Alps.

Synonym:

ICSD 74169

IMA1986-050

PDF 45-1483

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Bearthite Crystallography

Axial Ratios:

a:b:c =1.261:1:1.441

Cell Dimensions:

a = 7.231, b = 5.734, c = 8.263, Z = 4; beta = 112.57° V = 316.37 Den(Calc)= 6.59

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.05(1), 2.867(0.61), 2.568(0.39),

Physical Properties of Bearthite

Cleavage:

[???] Indistinct

Color:

Yellow, Colorless.

Diaphaniety:

Transparent to Translucent

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bearthite

Gladstone-Dale:

CI calc= 0.49 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1026,KC= 0.201

Optical Data:

Biaxial (+), a=1.662, b=1.671, g=1.696, bire=0.0340, 2V(Calc)=64, 2V(Meas)=65.

Calculated Properties of Bearthite

Electron Density:

r_electron=6.55 gm/cc
note: r_Bearthite=6.59 gm/cc.

Fermion Index

Fermion Index = 0.00056
Boson Index = 0.99944

Photoelectric:

PE_Bearthite= 4.34 barns/electron
U=PE_Bearthite x r_electron= 28.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bearthite is Not Radioactive

Bearthite Classification

Dana Class:

41.10.4.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.4)Dana Group

41.10.4.1 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

41.10.4.2 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

41.10.4.3 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

41.10.4.4 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Strunz Class:

VII/B.24-05 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.24 - Brackebuschite - Tsumebite group, Bearthite - Jamesite series

VII/B.24-05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-10 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-20 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-22 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

VII/B.24-25 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

VII/B.24-28 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

VII/B.24-30 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-40 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

VII/B.24-45 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2·(H2O) P 2₁,P 2₁/m Mono

VII/B.24-50 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-60 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-65 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

VII/B.24-70 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

Other Bearthite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

See Also:

Links to other databases for Bearthite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Bearthite

Ca2Al(PO4)2(OH)
Dana No: 41.10.4.2 Strunz No: VII/B.24-05
Locality:

Notes: